Global CH4 fluxes derived from JAXA/GOSAT lower-tropospheric partial column data and the CarbonTracker Europe-CH4 atmospheric inverse model Atmospheric Inverse Model
| dc.contributor.author | Tsuruta, A. | |
| dc.contributor.author | Kuze, A. | |
| dc.contributor.author | Shiomi, K. | |
| dc.contributor.author | Kataoka, F. | |
| dc.contributor.author | Kikuchi, N. | |
| dc.contributor.author | Aalto, T. | |
| dc.contributor.author | Backman, L. | |
| dc.contributor.author | Kivimäki, E. | |
| dc.contributor.author | Tenkanen, M.K. | |
| dc.contributor.author | McKain, K. | |
| dc.contributor.author | García, O.E. | |
| dc.contributor.author | Hase, F. | |
| dc.contributor.author | Kivi, R. | |
| dc.contributor.author | Morino, I. | |
| dc.contributor.author | Ohyama, H. | |
| dc.contributor.author | Pollard, D.F. | |
| dc.contributor.author | Sha, M.K. | |
| dc.contributor.author | Strong, K. | |
| dc.contributor.author | Sussmann, R. | |
| dc.contributor.author | Te, Y. | |
| dc.contributor.author | Velazco, V.A. | |
| dc.contributor.author | Vrekoussis, M. | |
| dc.contributor.author | Warneke, T. | |
| dc.contributor.author | Zhou, M. | |
| dc.contributor.author | Suto, H. | |
| dc.date | 2025 | |
| dc.date.accessioned | 2025-07-28T12:45:15Z | |
| dc.date.available | 2025-07-28T12:45:15Z | |
| dc.identifier.uri | https://orfeo.belnet.be/handle/internal/14124 | |
| dc.description | Satellite-driven inversions provide valuable information about methane (CH4) fluxes, but the assimilation of total column-averaged dry-air mole fractions of CH4 (XCH4) has been challenging. This study explores, for the first time, the potential of the new lower-tropospheric partial column (pXCH4_LT) GOSAT data, retrieved by the Japan Aerospace Exploration Agency (JAXA), to constrain global and regional CH4 fluxes. Using the CarbonTracker Europe-CH4 (CTE-CH4) atmospheric inverse model, we estimated CH4 fluxes between 2016–2019 by assimilating the JAXA/GOSAT pXCH4_LT and XCH4 data and surface CH4 observations independently of each other. The Northern Hemisphere CH4 fluxes derived from the pXCH4_LT data were similar to the estimates derived from the surface observations but were underestimated by about 35 Tg CH4 yr−1 (∼ 6 % of the global total) using the XCH4 data. For the Southern Hemisphere, the estimates from both GOSAT inversions were about 15–30 Tg CH4 yr−1 higher than those derived from surface data. The evaluations against independent data from the Atmospheric Tomography Mission aircraft campaign showed good agreement in the lower-tropospheric CH4 from the inversions using the pXCH4_LT and surface data. However, from these inversions, the modelled north–south gradients showed significant overestimation in the upper troposphere and stratosphere, possibly due to relatively uniform inter-hemispheric OH distributions that control CH4 sinks. Overall, we found that the use of the JAXA/GOSAT pXCH4_LT data shows considerable potential in constraining global and regional CH4 fluxes, advancing our understanding of the CH4 budget. | |
| dc.language | eng | |
| dc.title | Global CH4 fluxes derived from JAXA/GOSAT lower-tropospheric partial column data and the CarbonTracker Europe-CH4 atmospheric inverse model Atmospheric Inverse Model | |
| dc.type | Article | |
| dc.subject.frascati | Earth and related Environmental sciences | |
| dc.audience | Scientific | |
| dc.source.title | Atmospheric Chemistry and Physics | |
| dc.source.volume | 25 | |
| dc.source.issue | 14 | |
| dc.source.page | 7829-7862 | |
| Orfeo.peerreviewed | Yes | |
| dc.identifier.doi | 10.5194/acp-25-7829-2025 | |
| dc.identifier.url |